Some reasons to stop animal testing beside it being cruel?

There are several reasons why people are against animal testing. In the cosmetics industry people would test new cosmetics on animals before they tried them on humans. In order to see if the cosmetic had a negative effect it would have to be applied to the animal in an area that would show if there were an adverse reaction. The animal also has to be in a position where it cannot remove the product before there has been time for it to react with the animal.

So animals would be locked into apparatus that would not allow them to, for instance, rub their eyes if a new shampoo was being tested on them. Shampoo would be put into the animal's eye by the scientist and the eyes would be examined for reaction to the shampoo over a period of time and records would be kept. Animals used in experiments such as this would not, generally be kept alive after the experiment.

For some products there was a very controversial testing technique called LD50. In this experiment animals would be given a higher and higher dose of the substance until 50% of the animals had died (Lethal Dose 50%).

Some people say that human volunteers should be used instead of using animals who have no say in their involvement. Not of course for the LD50 type trials.